Cam-shaft drive.



E. P. NAGLE.

CAM SHAFT DRIVE.

APPLICATION FILED JAN. 20. 1915.

Pafented June 29, 1915.

MW. ll I lllluul owww 1N VENTOR rz'zz E'JI ZZyZa VITNES SES Y E N R O n A ERIN P. NAGLE, 0F EMERYVILLE, CALIFORNIA.

CAM-SHAFT muvn.

Specification of Letters Patent.

Application filed January 20, 1915. Serial No. 3,279.

'To all whomit mayconcem:

Be it known that I, ERIN P. 'NAGLE, a citizen of the United States, residing at Emeryville, in the county of Alameda and.

State of California, have invented new and useful Improvements in Cam-Shaft Drives, of which the following is a specification.

This invention relates to a cam shaft drive for internal combustion engines.

It is one of the obj ects'of the present invention toprovide a novel drive or connection between the crank-shaft and cam shaft on an internal combustion engine, whereby the cam shaft may be intermittently rotated at a speed ratio equal to that of the engine shaft, therebycausing a quick opening and closing of the valves, together with a complete open position period greater to-one gear drive now commonly in use;

Further objects will hereinafter appear. The invention'consists of the parts and .the construction and combination of parts as hereinafter more fully described and claimed, having reference to the accompanying drawings, in which 5 I Figure .1 is a central vertical section through .an internal combustion engine showing the application of the invention,

Fig. 2 is a plan. view of the Geneva move-- ment. Fig. 3 is a diagrammatic view of the valve movement.

A indicates in general a four cycle internal combustion engine, 2 the crank-shaft and 3 the cam shaft. The cam shaft is driven from the crank-shaft by the Geneva movement generally indicated at 4 and is in this manner intermittently turned 90 at a time or 360 or one complete revolution to 40 two of thecrank-shaft.

The proportion of the two members 5 and 6 of the Geneva movement'is such that the speed ratip of'one shaft, with relation to the other, while turning, is practically the same. This is a very important feature as it permits the exhaust and inlet. valves ,to be opened or closed much quicker thanwhere the two-to-one gear drive is used.

In the present instance by the use of an ordinary cam, such as is indicated at 7, it is possible to secure a complete opening of the valve during 15 of travel ofthe crankshaft as compared with 30 to 409 on the witnesses.

two-to-one gear'd'rive. It is also possible to retain the valve completely open during. a longer period than has heretofore been possible. For instance, by referring to diagram, Fig. 3, it is found that the valve is opened during 15 of crank travel. It thus remains completely open during 165 of crank travel and is again closed on 15 of travel, or, in other words, it ispossi-ble to open and close the valve during 30 of travel, thus making it possible to maintain.

a complete openingof 165 during a total travel of 195 of crank movement.

The materials and finish of the several parts. of the cam shaft drive are such as the experience and judgment ;of the manufac turer may dictate.-

I wish it understood that various changes in form, proportions, and minor'details of construction may be resorted to within the scope of the appended claim and that I do I not wish to limit myself to the specific design and construction here shown.

Having thus described my invention, what I claim and desire to secure by Letters Patent isj In combination, an engine having a hollow base, a crank shaft mounted in the base of the engine, a cam shaft also mounted in. the hollow base, a valve operating cam fixed on the cam shaft within the engine base 'for actuating a valve of the engine, the slotted member of a Geneva movement fixed to the cam shaftwithin the engine base adjacent the valve operating cam, and the co6perating member of the Geneva movementmounted on the crankshaft and having spaced annular flanges between which the slotted member is adapted to move to engage with the driving pins supported between the flanges of said cooperating member, the hub of .the slotted member beingdisposed in proximity to the periphery of the cooperating member to provide a compact arrangement.

In testimony whereof I have hereunto set my, hand in the presence of two subscribing ERIN r. NAGLE. Witnesses:

L. H. MANN,

L. Smna.

Patented June 29, 1915. v 

